Question

How is calcium oxide prepared?

• A. Thermal decomposition of $CaC{O}_3$
• B. Oxidation of $CaC{O}_3$
• C. Reduction of $CaC{O}_3$
• D. None of the above

Answer 1

The correct option is A Thermal decomposition of $CaC{O}_3$

Calcium oxide can be obtained by decomposing limestone at a high temperature.
$CaC{O}_3\stackrel{△}{\rightleftharpoons }CaO+C{O}_2$
$C{O}_2$ is removed as soon as it is produced to enable the reaction to proceed to completion.
Hence, the correct answer is option (a).